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Microstructure Investigation of Small-Section Nodular Iron Castings with Chunky Graphite

Asenjo, Iker and Lacaze, Jacques and Larrañaga, Pello and Méndez, Susana and Sertucha, Jon and Suarez, Ramon Microstructure Investigation of Small-Section Nodular Iron Castings with Chunky Graphite. (2010) Key Engineering Materials, vol. 457 . pp. 52-57. ISSN 1013-9826

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Official URL: http://dx.doi.org/ 10.4028/www.scientific.net/KEM.457.52

Abstract

Parameters that affect chunky graphite formation in heavy-section castings have been studied in previous works which showed that inoculation and cerium addition both increase the tendency for this degenerate graphite. This suggested that laboratory study on chunky graphite formation could be performed on small castings by over-treating the melt. Though the role of silicon was not ascertained, it appeared of potential interest to also investigate its effect in relation with the carbon equivalent of the iron and the nucleation potential of the melt. Keel-blocks were thus cast using Ce or Ce-Mg treated melts, with increased silicon content (up to 4.0 wt.%) and inoculation rate as compared to usual practice. It was observed that chunky graphite systematically appeared in more or less extended areas centred on the upper part of the keel-blocks. The as-cast microstructure (graphite shape and distribution) has then been studied in relation to melt composition and additions (Ce treatment and inoculation) in both affected and non-affected areas. Finally, microanalysis of oxides and other minor phases showed them to be similar to those appearing in heavy-section castings. It may then be concluded that chunky graphite appears in light-section castings in the same way than in heavy-section castings when using over-treated melts.

Item Type:Article
Additional Information:Thanks to Trans Tech Publications editor. The definitive version is available at http://dx.doi.org/ 10.4028/www.scientific.net/KEM.457.52
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > IK4 - Azterlan - Centro de Investigación Metalúrgica (SPAIN)
French research institutions > Centre National de la Recherche Scientifique - CNRS
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
Laboratory name:
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Deposited By: Denis Faragou
Deposited On:09 Nov 2012 16:06

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